A fun New York Times article by Sloane Crosley. She’s been using the same Louis Vuitton planner and inserts for 22 12 years and counting:

At the end of each year, I sit on the floor and go page by page through the old calendar, inking annual events into the new one, all the while watching my year in “dinner withs” skate by. When I’m done, I save the old calendar in the box of the new one and put it with the others on a shelf. It should be simple. But this way of life comes at a price.

As a genuinely absurd indulgence, I buy only the Louis Vuitton refills. The agenda itself is the one item I own from the brand, and my commitment to the gold-trimmed paper transcends reason. The price has increased to $50 from $20. To put it in perspective: In 2001, $20 seemed like an outrageous sum for a pile of hole-punched paper. I remember the first time I approached the stationery counter at the Louis Vuitton flagship on Fifth Avenue. I was awash in a kind of Swiss cheese outrage: There are holes in it! It’s not even all of the paper! Years later, in 2013? Filofax sells a refill with the same measurements … for $7.